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View Full Version : Alltrac / GT4 proper launch techniques?



3SmeCaptain
06-04-2008, 07:41 AM
to my understanding, a proper launch is the median point of the perfect combination of both torque and horse power within the rpm range to be held to do a proper take off. for example, my scion's proper launch is about 4,200-4,500rpm and can keep the wheels spinning through 2ng and at least chirp going into 3rd with a simple 100hp/100lbs torque engine. this sort of things goes for just about any other car too to my understanding regardless if it's front wheel drive or rear wheel drive.

my issue is, what would be the best proper launch for the alltrac / GT4? i always see in the rally videos, the alltrac / GT4 is just bouncing off the rev limiter and just takes off. and every video of any AWD similar to the Alltrac / GT4, I.E. Mitsu Eclipse GSX, Evo, Ford Escort, Nissan skyline, Suby WRX / WRX STi and so on, all bouncing the rev limiter to do a launch...

clearing me up on this would be very appreciative, just seems odd i suppose.

Denver_whiteST185
06-04-2008, 08:26 AM
the best launch ive done is quickly slipping the clutch while reving it around 5000-5500, and as soon as the clutch grabs, floor it. it'll take some practice, and its probably a good idea to learn when its slippery out after a good rain shower, and somewhere the cops aren't :p

this wasn't done on my car, it was done on a modified alltrac (around 250-275whp) with an upgraded clutch. if you do this on a stock car, or one with a well worn clutch, you'll either bog it or burn the clutch. also, ive seen an alltrac completely grenade its clutch at a drag strip launching at high RPM's (literally could not move with the clutch engaged) , so be careful.

donteatbugs
06-05-2008, 12:24 AM
i like the 2 step aproach. reving about 4500-5000 rpm and build about 4-7 psi. it makes for a nice launch. make sure you have a good clutch before you try this one though

Carolina91GT-S
06-05-2008, 01:49 AM
Similar technique for a half trac?

If it differs then how?

Denver_whiteST185
06-05-2008, 01:58 AM
Similar technique for a half trac?

If it differs then how?

Uh, if you launch a half-trac at 5500 while building boost, you'll probably just spin out the tires...

Luni
06-05-2008, 02:37 AM
Yeah, swapped celica and an alltrac would be totally different.

Alltrac launch would be like a DSM. Ive never LAUNCHED an alltrac, but Ive done it on a DSM many times.

DSM Id hold the throttle to about 5k rpm, then slip it lightly so I could build some boost, then once the car started to move forward Id floor it and drop the clutch mid slip

Always took off like a bat out of hell.

wizzards581
06-05-2008, 05:13 PM
alltrac.. 5k rpms...